Adding to the pressures on bitcoin early this morning, the Sydney Morning Herald reported that bitcoin users across Australia are reporting that their accounts have been abruptly frozen by the country's "Big Four" banks. And while the banks have remained largely tight-lipped about the closures, many angry account-holders are jumping to conclusions and blaming the banks for punishing them because of their involvement with bitcoin. According to the Herald, cryptocurrency trader and Youtuber Alex Saunders called out National Australia Bank, ANZ, the Commonwealth Bank of Australia and Westpac Banking Corporation on Twitter for freezing customer accounts and transfers to four different bitcoin exchanges - CoinJar, CoinSpot, CoinBase and BTC Markets. In response, some users complained that their activities with the cryptocurrency had still been described as a "security risk by their financial institutions. While not every bank had explicit policies governing their relationship with cryptocurrencies, according to the Morning Herald, Commonwealth Bank's June 2017 terms and conditions for CommBiz accounts specifically excludes this activity, saying it can refuse to process an international money transfer or an international cash management transaction "because the destination account previously has been connected to a fraud or an attempted fraudulent transaction or is an account used to facilitate payments to Bitcoins or similar virtual currency payment services.